==========================================================================
Ubuntu Security Notice USN-8414-1
June 09, 2026

openssl vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in OpenSSL.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools

Details:

Frank Buss discovered that OpenSSL had a heap buffer over-read in ASN.1
content parsing. An attacker could possibly use this issue to cause OpenSSL
to crash, resulting in a denial of service, or obtain sensitive
information. (CVE-2026-34180)

Pavol Zacik and Alex Gaynor discovered that OpenSSL incorrectly accepted
PKCS#12 files with short HMAC keys when using PBMAC1. An attacker could
possibly use this issue to bypass integrity checks. This issue only
affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-34181)

Asim Viladi Oglu Manizada and Alex Gaynor discovered that OpenSSL could
accept forged CMS AuthEnvelopedData messages. An attacker could possibly
use this issue to bypass message authentication checks. (CVE-2026-34182)

Abhinav Agarwal discovered that OpenSSL had unbounded memory growth in the
QUIC PATH_CHALLENGE handler. A remote attacker could possibly use this
issue to cause OpenSSL to use excessive resources, leading to a denial of
service. This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS.
(CVE-2026-34183)

Sunwoo Lee, Hyuk Lim, and Seunghyun Yoon discovered that OpenSSL had a NULL
pointer dereference in QUIC server initial packet handling. A remote
attacker could possibly use this issue to cause OpenSSL to crash, resulting
in a denial of service. This issue only affected Ubuntu 25.10 and Ubuntu
26.04 LTS. (CVE-2026-42764)

Mayank Jangid, Kushal Khemka, Hari Priandana, Bhabani Sankar Das, and Qifan
Zhang discovered that OpenSSL had a possible NULL dereference in password-
based CMS decryption. An attacker could possibly use this issue to cause
OpenSSL to crash, resulting in a denial of service. (CVE-2026-42766)

Zhanpeng Liu, Guannan Wang, and Guancheng Li discovered that OpenSSL had a
NULL pointer dereference in CRMF EncryptedValue decryption. An attacker
could possibly use this issue to cause OpenSSL to crash, resulting in a
denial of service. (CVE-2026-42767)

Alex Gaynor discovered that OpenSSL had a Bleichenbacher oracle in
CMS_decrypt() and PKCS7_decrypt() with multiple RecipientInfo values. An
attacker could possibly use this issue to obtain sensitive information.
This issue only affected Ubuntu 25.10 and Ubuntu 26.04 LTS.
(CVE-2026-42768)

Alex Gaynor discovered that OpenSSL had a trust-anchor substitution issue
in CMP rootCaKeyUpdate processing. An attacker could possibly use this
issue to bypass certificate trust validation. This issue only affected
Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-42769)

Alex Gaynor discovered that OpenSSL used attacker-supplied parameters when
validating FFC-DH peers. An attacker could possibly use this issue to
weaken key validation and compromise security guarantees. (CVE-2026-42770)

Alex Gaynor discovered that OpenSSL could ignore the IV in AES-OCB mode on
the EVP_Cipher() path. An attacker could possibly use this issue to bypass
cryptographic protections and obtain sensitive information.
(CVE-2026-45445)

Alex Gaynor discovered that OpenSSL had incorrect tag processing for empty
messages in AES-GCM-SIV and AES-SIV modes. An attacker could possibly use
this issue to bypass cryptographic integrity checks. (CVE-2026-45446)

Thai Duong discovered that OpenSSL had a heap use-after-free in
PKCS7_verify(). An attacker could possibly use this issue to cause OpenSSL
to crash, resulting in a denial of service, or execute arbitrary code.
(CVE-2026-45447)

Zehua Qiao and Jinwen He discovered that OpenSSL had a possible heap buffer
overflow in ASN.1 multibyte string conversion. An attacker could possibly
use this issue to cause OpenSSL to crash, resulting in a denial of service,
or execute arbitrary code. (CVE-2026-7383)

Bhabani Sankar Das discovered that OpenSSL had an out-of-bounds read in CMS
password-based decryption. An attacker could possibly use this issue to
cause OpenSSL to crash, resulting in a denial of service. (CVE-2026-9076)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
  libssl3t64                      3.5.5-1ubuntu3.2
  openssl                         3.5.5-1ubuntu3.2

Ubuntu 25.10
  libssl3t64                      3.5.3-1ubuntu3.4
  openssl                         3.5.3-1ubuntu3.4

Ubuntu 24.04 LTS
  libssl3t64                      3.0.13-0ubuntu3.11
  openssl                         3.0.13-0ubuntu3.11

Ubuntu 22.04 LTS
  libssl3                         3.0.2-0ubuntu1.25
  openssl                         3.0.2-0ubuntu1.25

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-8414-1
  CVE-2026-34180, CVE-2026-34181, CVE-2026-34182, CVE-2026-34183,
  CVE-2026-42764, CVE-2026-42766, CVE-2026-42767, CVE-2026-42768,
  CVE-2026-42769, CVE-2026-42770, CVE-2026-45445, CVE-2026-45446,
  CVE-2026-45447, CVE-2026-7383, CVE-2026-9076

Package Information:
  https://launchpad.net/ubuntu/+source/openssl/3.5.5-1ubuntu3.2
  https://launchpad.net/ubuntu/+source/openssl/3.5.3-1ubuntu3.4
  https://launchpad.net/ubuntu/+source/openssl/3.0.13-0ubuntu3.11
  https://launchpad.net/ubuntu/+source/openssl/3.0.2-0ubuntu1.25